Choose the first letter of the word that best fits the description: A mark left after injured tissue has healed C G S T

The fisrt letter of a word that describes a mark left in the skin after it has been healed is S, for a scar is the result of a natural process that the body has for renewing its tissues after an accident that affected it. The scar has the same proteine that the skin tissue it is going to replave has, it's called collagen.